The necessary implication of your post is that "St." Marcel Lefebvre, patron "saint" of the excommunicati, wallowed in sin for years from 1965 until 1988 not leading his gullible followers out of the Church of Rome after he had already achieved, as head of the Rota or Marriage Court, the opening up of the regime of annulment mills in the Church of Rome.
Either you are a sedevacantist or you reject the authority of the papacy itself. It is NOT enough to say that you may pray for this poor heresy ridden pope that he may return to YOUR church. You do not get to work the cafeteria and call yourself Catholic and the persistent practice of scandalizing others to reject actual Authority is no moral merit either.
Bushwah!
What about churches that claim to be Catholic and accept the authority of the pope yet teach some really bad things?I don't know where you live, but if there are any Hispanic Catholic churches in your area you ought to visit a few. It will make your jaw drop when you see the things that are taught and how full of superstition they are. They're one-third Christian and two-thirds Central and South American folk religion.
You, as a knowledgeable Catholic, have much more in common with even the shakiest of Protestant churches than you would with most Hispanic Catholic churches. I kid you not -- go see for yourself if you can. You'll come away a little less dogmatic on the idea that there are no divisions within Catholicism.